package com.hmdp.utils;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisWorker {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    private static final long BEGIN_TIMESTAMP = 1753747200L;
    private static final int COUNT_BITS = 32;
    public long nextId(String keyPrefix){
        //1生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);//单个key自增长是有上限的


        return timestamp<<COUNT_BITS | count ;   //3拼并返回
    }
}
